The Amari brother and sister duo

Machiko Amari and her brother Kiyoshi have just started at Ouran Academy, after their family inherited 9 and 1/2 yen from a distant relative. Machiko had no friends in their old school and talked to no one but Kiyoshi, so, worried the same will happen again, he takes her to the Ouran Host Club to find someone to talk to, but what he doesn't know is what awaits them in that world.